Ant enrichment?

Hey there everyone! I was sitting the other day and watching my colony run around after their feeding time the other day and wondered.. how can I enrich these ladies' lives? My colony has ~200 ants and at this point I'd really like to give them something else to do. They're only in a Wakooshi Venus nest (so a triple test rube rack, small outworld section, and I've connected some PVC tubing to an extra test tube with some sugar water in it. I'll definitely be giving them more living space but was curious what you guys do, if at all, to give your colonies some diversity? I'd love to hear from you guys! T.I.A.